FreeBSD_HEAD_i386 - Build #2848 - Fixed

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FreeBSD_HEAD_i386 - Build #2848 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2848/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2848/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_i386/2848/console

Change summaries:

297921 by mav:
Add hint.ahci.X.quirks tunable for some odd cases.

MFC after:	2 weeks

297917 by andrew:
Document the memory ranges within the kernel region to help with debugging
to track down which region an address is from.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation

297916 by davidcs:
Fix compilation error on i386